Car-brake-operating mechanism



Patented Mar. 18, 1924.

UNITED sTATEs WILLIAM D. BREWSTER, OF SYRACUSE, NEW YORK, ASSIGNOR T0 NATIONAL BRAKE l 1,481,532 ena-ENT orme-E.

COMPANY, INC., OF BUFFALO, NEW YORK, A CORPORATION OF NEW' YORK.

CAB-BRAKE-OPERATING MECHANISH.

Application led August 4, 1923. Serial No. 655,712.

To all whom z't may concern.'

Be it known that I, WILLIAMD. BREWSTER, a citizen of the United States of America., of Syracuse, in the county of Ononda a, in the State of New York, have invent new and useful Improvements in Car-Brake-Operating Mechanism, of which the following, taken in connection with the accompanying drawings, is a full, clear, and exact description.

This invention relates to car brake operating mechanism of the class set forth in my Patent Number 1,144,104 February 6, 1923 except that the main object of the present invention is to make the vertical operating staff of the saine angular cross section an size from end to end so that it may be cut to the desired length from stock bars and inserted axially through corresponding an gular openings in the driving pinion and in suitable rotary bushings which are journaled in the frame at opposite ends of the pinion thereby avoiding the expensive forging and machining of the staff, retaining its full strength throughout its length end permitting it to be more easily and quickly assembled than would be possible 'with a staff having portions thereof round and other portions angular in cross section.

Another object is to provide an end thrust bearing for the lower end of the staff as a.

part of the main supporting frame for sup.

porting the weight of the shaft a ainst downward displacement independenty of the pinion thereby leaving the latter free t0 rotate with a minimum amount of friction' and also affording a basis for measurement of the height of the shaft independently of the pinion for supporting the hand wheel at the desired height.

Other objects and uses relating to specific parts of the device will be brought out in the following description.

In the drawings:

Figure l is a top plan, partly broken away and partly in section, of a car brake operating mechanism embodying the various features of my invention, the upper portion of the stati` and brake wheel being omitted.

Figure 2 is a vertical sectional view taken in the plane of line 2*2, Figure 1, showing the brake staff, aspartly broken away, and the operating wheel on the upper end of the stall'.

'at opposite ends of t and an underlying substantially U-shapedv brace bar -2- having its endsvintegrally united to the corresponding ends of the top plate and its intermediate portion in spaced relation thereto, the smaller end of the top plate and opposite arms of the head being provided with bolt openings for receiving bolts -3 by which the frame may berigidly secured to the under sideof the platform or other part of a car in a suitable position for, attaching the brake operating cable to the brake beam not shown.

, The head as --4-, of the top plate -land underlyin are arranged in vertically spaced relation for receiving a pinion -5- andl are provide-d with vertically alined similar journal openings -6 for receiving a pair of similar journal sleeves, -7- of bronze or other suitable metal capable of resisting to a maximum degree, thev strains and wear to which they are subjected.

cent portions of thetop plate -1 and brace bar-Q to permit them to be inserted from either side into said space and thence to Atheir respective journal bearin s -6-, the inner or adjacent endsv of said sleeves being provided with annular flanges -8- of relatively larger diameterl than their respective openings -6- to prevent their outward displacement.

That is, the sleeves -7- are rotatably mounted in their resplective openings -6- e pinion -7- which substantially iills the intervening space and serves to hold the sleeves against inward displacement.

The sleeve -7- and pinionV -5- are provided with similar vertically registering openings -9' and. 10- of angular, in

this instance square,'cross section for receivis inserted from the top downwardly through the registering openings-9 and -10- in t-he sleeves -7- and pinion -5- and has its lower end resting upon a rounded or convex end thrust hearing -13 which is formed upon an extension -14- of the adjacentl side of the brace bar -2- for limiting the downward movement of the staff and affording a convenient end thrust bearin therefor, so that the stati may be rotate freely with a minimum amount of 4 frictional resistance.

A suitable hand wheel 15 may be secured to the upper end of the staff -1 at any desired height most convenient for operation either vfrom the latform bumper beams or from the top oiD the car dependving uponv the class of car with which the bra-ke operating mechanism is to be used.

The bearing 1B- is spaced apart from the lower end of the lower sleeve 8 while the lower end of the staff 1lextends across the intervening space and isprovided with a cotter key -16- or equivalent stop for upward displacement of the staff.

:The intermediate portion of the plate 1 is provided with a vertical opening -17- in vertical alinement with a socket .18- in the underlying portion of the brace bar 2'- for receiving and supporting a vertical shaft -19- which extends across the intervening space between the top plate -1- and central portion of the brace bar -2- and has its lower end seated in the socket`18 and secured therein by a.v pin -20-', the lower wall of said socket being provided with a reduced cenporting said drum coaxially with and upon t said shaft.

A hardened washer E25- is interposed between the lower end of the drum -22- and adjacent portion of the brace bar -2 to form anend thrust bearing for said drum and to permit the same to rotate freely with Ia minimum amount of friction, the axial length ofthe hub of the drum being substantially equal to the distance between the end thrust bearing -25-'- and underside of the top plate -1- for limiting endwise movement of said drum.

This drum is provided with peripheral gear teeth 26- meshing with the pinion -5- for receiving rotary motion therefrom and is also provided with one side preferably below the gear with intersecting radial and axially extending sockets 27- and -28-, the radial sockets serving to receive one of thc links ofa chain or cable 29 while the vertical slot serves to receive a locking pin M30-1 adapted to pass through the link in the slot -27- for attaching the chain to the drum.

The slots --27- and -28- are elongated radially to permit the bolt -30- and link of the chain -29- to have a limited radial movement, the bolt being provide-d with a head -31 which is slidable in a radial slot -32- in the upper portion of the drum and forming an enlargement of vthe upper end of the slot -28-.

The outer end of the slot -32- is covered by a ledge -33- overhanging the head of the bolt when the latter 1s moved to its outward position to prevent withdrawal of said bolt from the slot -28-.

A counter key or pin 34- is inserted through registering openings in opposite walls of the slot -32- across the inner face of the head 3lof the bolt to limit the inward movement of the bolt when the chain is attached to the drum for use.

It will be noted, however, that by removing the key or pin -34-, the bolt -30- may be moved inwardly from under the ledge 33- and then withdrawn upwardly when it is desired to detach or rei attach the chain therefrom or thereto.

'lVhen the bolt -30- with the chainattached thereto is adjusted for use, it is disposed some distance from the axis of revolution of the drum, the object of whichris to take up the 4slack of the chain quickly when the drum is rotated for applying the brakes during which time, the adjacent portions of the chain are wound upon an under- Y lying conical portion -35- of said drum .so that as the winding continues, the powerv applied to the application of the brakes increases and this power is further increased' by making the diameter of the pinion -5- relativelyvsmall as compared with that of` That I claim is:

1. In a car brake operating mechanism, a main supporting fra-me, a drum journaled onthe frame, means for rotating the drum including a vertical operating staff ofthe same angular cross section and sizefrom end to end, and a driving pinion on said statt, said frame being provided with an end thrust bearing engaging the lower end of the staff. Y Y Y 2. .In a car brake operating mechanism, a main supporting frame, a drum journaled in the frame, means for rotating the drum including a vertical operating stati of the same angular cross section and size from end to end, a driving plmon on sa1d staff in combination with bushings mountedupon the staff and engaged in journal bearings on the frame at opposite ends of the pinion.

3. In a car brake operating mechanism, a main supporting frame, a drum journaled in the frame, means for rotatin the drum including a pinion having an axial opening of angular cross section therethrough, an operating staff having an angular portion extending through the angular openin of the pinion in combination with bushmgs journaled in the frame at op ite ends of the pinion and provided w1t axial openings of angular cross section for receiving the angular portion of the sta.

4. In a car brake operating mechanism a main supporting frame, a drum journaled in the frame, means for rotatin the drum including a vertical operating s aft, and-a. pinion splined on the staff to rotate therewith, and to .permit the staff to be with- WILLIAM D. BREWSTER.

Witnesses:

H. E. Cunas, Rm Cammina 

